Method for acetylene hydrochlorination to vinyl chloride catalyzed by ultra-low content aurum-based material

A method for acetylene hydrochlorination to vinyl chloride catalyzed by aurum-based

• catalyst comprising using the aurum-based catalyst reacting acetylene and hydrochloride (HCl) under Gas Hourly Space Velocity of C2H2 (acetylene) (GHSV(C2H2)) being 170 h−1, volume ratio of acetylene to hydrochloride of V(C2H2)/V(HCl)=1:1.05, and reaction temperature of 180° C. to obtain vinyl chloride wherein the reaction route is as follows:
• C2H2+HCl→C2H3Cl
• wherein the method further comprises preparing the aurum-based catalyst for acetylene hydrochlorination to vinyl chloride comprises the following steps:
• (1) preparing a precursor solution:
• dissolving 0.1082 g of chloroauric acid (HAuCl4·4H2O solids with Au≥47.5% in the HAuCl4·4H2O solids) in isopropanol (IPA) by shaking and ultrasonic treatment;
• adjusting a ratio of isopropanol to chloroauric acid to prepare the IPA solution of HAuCl4·4H2O as 0.2164 mg HAuCl4·4H2O/100 μL IPA;
• (2) preparing a nitrogen-modified carbon support:
• weighing 3 g of 200 mesh activated carbon into a beaker containing 25 mL of deionized water, and adding 1.5 mL of glacial acetic acid under stirring at room temperature for 30 min;
• further adding 25 mL of deionized water, 1.0 g of nitrogen source 1,10-phenanthroline and 1.5 mL of 30% hydrogen peroxide successively into the beaker, and continuing stirring at room temperature in dark for 24 h;
• filtering and drying the mixture in an oven at 90° C. for 12-24 h;
• calcinating the filtered and dried mixture under a nitrogen flow rate of 50 mL/min and a heating rate of 5° C./min in a tube furnace, increasing the calcination temperature to 900° C. and keeping for 1 h to obtain a nitrogen-modified carbon support;
• (3) preparing the catalyst by an impregnation method:
• taking 2999.7 mg of the nitrogen-modified carbon support prepared in step (2), and laying it in a mortar;
• taking 292 μL of the HAuCl4·4H2O solution prepared in step (1), adding isopropanol to 6 mL, and then uniformly dropwise adding it onto the above nitrogen-modified carbon support to finally obtain nitrogen-modified carbon support/g:
• solution/mL=0.5;
• the catalyst is thoroughly ground in the clockwise direction to have a smooth surface, and the mass ratio of the aurum to the nitrogen-modified carbon support is 0.01:99.99;
• (4) drying the ground catalyst in a blast drying oven for 12-24 h.