器外预硫化催化剂的硫转化研究

STUDY ON THE SULFUR CONVERSION OF EX-SITU PRESULFURIZED HYDROGENATION CATALYST

在全自动化学吸附仪上分别研究了担载硫化剂A和硫化剂B的器外预硫化催化剂A 和催化剂B在常压情况下与氢气的反应情况,在微反装置上研究了催化剂B在高压情况下与氢气的反应情况,并用元素分析仪对实验前后催化剂的元素含量和持硫率进行了测定。结果表明,催化剂A上的硫化剂常压下不能转化为硫化氢,并且容易流失,330℃时催化剂的持硫率为18．4％。而在相同条件下,催化剂B上的硫化剂很容易转化为硫化氢,330℃时催化剂的持硫率为89．9％。催化剂B在氢气压力为3．5 MPa下与氢气反应后,催化剂的持硫率在73％以上,硫的有效转化率高;生成的硫化氢范围较宽,几乎涵盖了本次实验所有的温度区间,产生硫化氢峰值的温度为225～ 230℃和300～310℃。催化剂B适合于工业使用。

Two ex-situ presulfurized hydrogenation catalysts, Cat A and Cat B, were prepared by using two different sulfurizing agents and their behaviors with hydrogen at atmospheric pressure and at 3.5 MPa were studied by an auto-chemical adsorption equipment and a micro-activity unit, respectively. An elemental analyzer was used to determine the sulfur contents of the catalysts before and after testing, then, sulfur holding rates of the catalysts were calculated. Test results showed that the sulfurizing agent of Cat A could not be converted to hydrogen sulfide at atmospheric pressure, and it was hard to keep, the sulfur holding rate of Cat A was only 18. 4% at 330 ℃. On the contrary, the sulfurizing agent of Cat B could be easily converted to hydrogen sulfide and the sulfur holding rates of Cat B at atmospheric pressure and at hydrogen partial pressure of 3.5 MPa were 89.9% and more than 73%, respectively. In addition, hydrogen sulfide could be detected in all the testing temperature range with peak value at the range of 225-230 ℃ and 300-310℃, respectively. Thus, Cat B was recommended to be applied commercially.