Two isostructural nanocage-based porous Ni/Co(II)-MOFs have been hydrothermally synthesized, which were interestingly composed of icosahedron and tetrahedron cages with a new (3,8)-connected 3D topology. Moreover, the stable Ni-MOF exhibits good selective CO2/CH4 and CO2/N2 adsorption owing to its exposed nitrogen active sites.

Nanocage-Based Porous Metal-Organic Frameworks Constructed from Icosahedrons and Tetrahedrons for Selective Gas Adsorption.

The invention relates to the field of automobile exhaust purification and concretely relates to an automobile exhaust cleaning agent. The automobile exhaust cleaning agent comprises potassium permanganate, active carbon, pentaerythritol, methanol, diethanolamine, diethylene glycol, coconut diethanolamide, ethanol, nickel oxide and copper oxide. Coconut diethanolamide as a surfactant and diethylene glycol as a cosolvent are used for effectively removing greasy dirt and deposited carbon on the inner wall of an internal combustion engine. Through combination of diethanolamine as organic base and diethylene glycol, metal pollutants can be effectively removed. Nickel oxide and copper oxide respectively catalyze carbon monoxide and nitrogen oxide so that the carbon monoxide and nitrogen oxide undergo a reaction to produce small-pollution or pollution-free produce gas. Diethylene glycol has double effects and thus a diethylene glycol use amount is very important. The automobile exhaust cleaning agent can effectively purify automobile tail gas, can be used for cleaning an internal combustion engine, improves fuel oil efficiency and reduces oil consumption.

Automobile exhaust cleaning agent

The invention relates to the technical field of the oil contamination cleaning agent, in particular to an oil contamination cleaning agent and a preparation method thereof. The oil contamination cleaning agent provided by the invention is good in cleaning strength and quick to volatilize, and is an environment-friendly cleaning agent; and the preparation method of the oil contamination cleaning agent is simple in operation, low need for equipment, easy for preparation, low in production cost and advantageous for generalization and application, and raw materials are easily available.

Oil contamination cleaning agent and preparation method thereof

The utility model discloses a gas nozzle cleaning device. The gas nozzle cleaning device comprises an oil storage tank, an electronic oil pump, a filter, an oil inlet pipe and an oil outlet pipe. A liquid filling opening is formed in the oil storage tank. The electronic oil pump is arranged in the oil storage tank. The filter is arranged in the oil storage tank and connected with the electronic oil pump. The liquid inlet end of the oil inlet pipe is connected with the filter, and the liquid outlet end of the oil inlet pipe is connected with the gas inlet end of a nozzle assembly to be cleaned. The liquid inlet end of the oil outlet pipe is connected with the gas outlet end of the nozzle assembly to be cleaned, and the liquid outlet end of the oil outlet pipe is connected with the oil storage tank. The gas nozzle cleaning device is simple and reasonable in structure, can be used for cleaning a plurality of nozzles at a time under the condition that the nozzles are not disassembled, the nozzles are protected to the maximum, the service cycle of the nozzles is prolonged to the maximum, the cleaning efficiency is increased, and the maintenance cost is lowered.

Gas nozzle cleaning device

The invention provides a gas control system capable of supplying a mixed gas at a predetermined concentration or flow rate, preventing droplets produced by the reliquefaction of the material gas or particles produced by the thermal decomposition of the material from affecting the concentration or flow control. The gas control system includes: a first valve that is provided in a carrier gas line or in a gas supply line; a flow rate control mechanism that is provided in a diluent gas line and includes a flow rate sensor and a second valve; a contactless type first concentration sensor; a first valve control part; a diluent gas setting flow rate calculation part adapted to, on the basis of a preset setting total flow rate of a post-dilution mixed gas and a post-dilution measured concentration, calculate a diluent gas setting flow rate that is a flow rate of a diluent gas to be flowed through the diluent gas line; and a second valve control part adapted to control the opening level of the second valve so as to decrease the deviation between the diluent gas setting flow rate and a measured flow rate measured by the flow rate sensor.

Gas control system and control method for gas control system

The invention discloses an anti-explosion multi-component dynamic air distribution device and method. The device comprises a low-pressure air distribution system 15, an air compression generation device 16, a pressurization system 17, a vacuumization system 18 and a filling system 19. Through the adoption of a back pressure valve, the pressure of gas at the gas outlet end of the back pressure valve is stable before the gas enters a gas mixer, so that an anti-explosion effect is achieved; due to the adoption of a variable frequency diaphragm compressor, product gas is high in purity and free of impurity gas pollution; moreover, the pressure in the low-pressure air distribution channel is stabilized in a safe pressure range by adjusting the working frequency of the variable frequency diaphragm compressor to achieve the anti-explosion effect; flow control ranges of n mass flow controllers are distributed in a trapezoidal shape for real-time control on gas flow, so that the air distribution precision is improved; air generated by the air compressor is utilized as a diluent gas channel, so that the cost is saved; an alarm function can be performed in an air distribution process.

Anti-explosion multi-component dynamic air distribution device and method

The invention discloses a disassembly-free cleaning agent for a fuel spray nozzle and belongs to the field of automobile engines On the basis that the total mass of the cleaning agent is 100 percent, the disassembly-free cleaning agent for the fuel spray nozzle comprises the following components in percentage by mass: 5 to 22 percent of decarbonizer, 3 to 25 percent of accelerant, 10 to 25 percent of combustion improver and 40 to 80 percent of diluent The disassembly-free cleaning agent for the fuel spray nozzle is prepared by uniformly mixing the decarbonizer, the accelerant, the combustion improver and the diluents at normal temperature and normal pressure The cleaning agent can effectively clean deposit of the fuel spray nozzle, avoids deformation and swelling of plastic and rubber,is combusted completely, avoids engine knocking and does not corrode metal parts

Disassembly-free cleaning agent for fuel spray nozzle

Belonging to the technical field of gas preparation, the invention discloses an ultra-pure mixed gas preparation system and method. The system includes: a component gas supply unit, a diluent gas supply unit, a mixed gas preparation unit, an analysis unit, a gas bottle and a balance. The mixed gas preparation unit is respectively connected to the component gas supply unit, the diluent gas supply unit and the gas bottle. The analysis unit is in connection with the component gas supply unit and the diluent gas supply unit respectively. The invention also provides a method adopting the ultra-pure mixed gas preparation system. The steps include: 1. gas purification and test; 2. mixed gas filling; and 3. inspection of mixed gas quality. By using the system provided by the invention to prepare gas, after the raw material gas is purified into ultra-pure gas by a purifier, ultra-pure mixed gas can be prepared immediately without filling. Thus, while the mixed gas purity and gas preparation accuracy are ensured, the raw material gas dosage is reduced, and the gas preparation time is saved.

Ultra-pure mixed gas preparation system and method

The invention relates to a blowing sampling system and a blowing sampling method for the analysis of content of impurities in gas, and belongs to the technical field of gas sampling and analysis. In the blowing sampling system, a sampling gas path is connected with an analytical instrument (10), a gas source to be detected (4) and a blowing gas source (7) are respectively accessed into the sampling gas path through respective switch valves, a gas path switch valve (6) is arranged on the sampling gas path between the gas source to be detected (4) and the blowing gas source (7), and an adjustable flow valve (9) is arranged at the gas inlet end of the analytical instrument (10); a vacuum pump (1) is connected with one side of the sampling gas path, in which the gas path switch valve (6) is connected with the gas source to be detected (4); the vacuum pump (1) is accessed into the sampling air path through a vacuum pump switch valve (2), and a vacuum pressure gage (3) is arranged on the sampling gas path between the vacuum pump switch valve (2) and the gas path switch valve (6). The blowing sampling system can shorten the blowing time, increase the detection speed, and reduce the consumption of a blowing air source.

Blowing sampling system and blowing sampling method for analysis of content of impurities gas

Synthesis and structure of Pb13Na(μ3-O)(μ3-OH)(BDC)12: A holodirected/hemidirected mixed Pb–Na heterometal coordination polymer with Pb12O20 cage

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