Carrier Modification On The Influence Of The Ruthenium Catalysts For Acetylene Hydrochlorination

Polyvinyl chloride（PVC） resin is one of the five major engineering plastics in the world, has a verywide application in all walks of life. There are two main methods, ethylene and acetylene method, producing PVC in the industrial. At present, a lot of developed countries adopt ethylene method using the petrochemical resources while the acetylene method is becoming a key means of PVC production in China because of less oil reserves and relatively rich in coal resources. Mercuric chloride catalyst is widely used in the process of producing vinyl chloride with ideal catalytic activity and selectivity. But, the problem of plagueding PVC processing route long time is the sublimation of mercuric chloride catalyst, the toxicity caused by the loss and the pollution problems. To realize the sustainable development of PVC processing route, it is necessary to develop environmental friendly, high performance and can replace mercury catalyst’s new mercury-free catalysts. This article mainly probe from the carrier modification on the influence of Ru catalyst active components and particle size. The main research content for the following three aspects:（1） Ru/g-C₃N₄ NS-CNT catalyst was prepared with nitrogen compound material（g-C₃N₄ NS-CNT） as the support and RuCl3 as precursor. N2 adsorption stripping curve（BET） shows that g-C₃N₄ NS-CNT is porous structure material, which canprovide a large amount of active sites. X-ray diffraction（XRD） shows that the characteristic structural features of g-C₃N₄ and CNTs are well preserved in the 3D g-C₃N₄ NS-CNT composite. Strong coupling between the g-C₃N₄ NSs and CNTs in the assembled 3D g-C₃N₄ NS-CNT was confirmed by X-ray photoelectron spectroscopy（XPS）.The active test shows that Ru-based catalysts with composite support have a certain degree of improvement.（2） Liquid-phase oxidation with one step and two step method was developed for the activation of activated carbon. Ru-based catalysts were prepared by precipitation-impregnation and reduction method. The active test shows that Ru-based catalysts supported on activated carbon prepared by this two-step liquid oxidation method show higher initial activity and faster the deactivation rate. The characterization of TEM and CO-TPD explain the reason that on the basis of this two step liquid oxidation method, AC-supported ruthenium catalysts were prepared with uniform Ru nanoparticles in the small particles.（3） The surface of the activated carbon（AC） was modified by-NO2,-NH2 and-NHN functional groups respectively. Ru-based catalysts were prepared by volumetric impregnation method with AC and modified activated carbon as the supports and RuCl3 as precursor. Fourier-transform infrared spectroscopy（FT-IR）, N2 adsorption stripping curve（BET） and element analysis verify the introduction of nitrogen functional groups. X-ray photoelectron spectroscopy（XPS） analysis and peak softwareillustrate the change of different species of Ru-based catalyst. Using Temperature-programmed desorption（TPD） to observe the HCl and C2H3 Cl adsorption. The test shows that the active of Ru-based catalysts with the modified supports have greatly improved compared with the unmodified catalyst, the main reason owing to the increase of RuO2 active component and the enhancement of HCl absorption.