论文部分内容阅读
以正庚烷为裂化原料，采用微反活性评价装置和气相色谱分析方法研究了重金属钒对ＣＲＣ－３裂化催化剂选择性的影响，并用Ｘ射线衍射仪测定了经钒污染后催化剂相对结晶度的变化．结果表明，ＣＲＣ－３催化剂上沉积的钒具有脱氢活性，明显降低了催化剂的裂化反应选择性和相对结晶度．向ＣＲＣ－３催化剂中加入高岭土或α－Ａｌ２Ｏ３担载的稀土氧化物（ＲＥ２Ｏ３），可明显提高催化剂的抗钒污染能力．
The influence of heavy metal vanadium on the selectivity of CRC-3 cracking catalyst was studied by using micro-activity evaluation device and gas chromatographic analysis method with n-heptane as cracking raw material. The relative crystallinity of vanadium-contaminated catalyst was measured by X-ray diffractometer Variety. The results show that the vanadium deposited on the CRC-3 catalyst has dehydrogenation activity, significantly reducing the cracking selectivity and relative crystallinity of the catalyst. Addition of rare earth oxide (RE2O3) supported on kaolin or α-Al2O3 to CRC-3 catalyst can obviously improve the anti-vanadium pollution resistance of the catalyst.