通过实验考察了四个不同催化反应的温度 T 及空速 H_v 对流动反应器催化转化率 x 的影响:(1)柴油所含芳烃的加氢饱和;(2)甲醇分解制氢;(3)渣油加氢脱硫;(4)一氧化碳水煤气变换反应,研究了流动反应器中催化反应转化率 x 与反应温度 T 及...通过实验考察了四个不同催化反应的温度 T 及空速 H_v 对流动反应器催化转化率 x 的影响:(1)柴油所含芳烃的加氢饱和;(2)甲醇分解制氢;(3)渣油加氢脱硫;(4)一氧化碳水煤气变换反应,研究了流动反应器中催化反应转化率 x 与反应温度 T 及空速 H_v 的关系。对所得实验数据进行了拟合,提出一个新的反应转化率 x 表达式,其中α为反映空速 H_v 对转化率 x 影响的参数,k′_i(i=1,2,3)为与温度有关的系数。以此关系式对实验数据的拟合结果令人满意,平均相对误差小于2.0%。展开更多
There is a relatively low efficiency of Fe(Ⅲ)/Fe(Ⅱ) conversion cycle and H2 O2 decomposition(<30%) in conventional Fenton process,which further results in a low production efficiency of ·OH and seriously res...There is a relatively low efficiency of Fe(Ⅲ)/Fe(Ⅱ) conversion cycle and H2 O2 decomposition(<30%) in conventional Fenton process,which further results in a low production efficiency of ·OH and seriously restricts the application of Fenton.Herein,we report that the commercial MoO2 can be used as the cocatalyst in Fenton process to dramatically accelerate the oxidation of Lissamine rhodamine B(L-RhB),where the efficiency of Fe(Ⅲ)/Fe(Ⅱ) cycling is greatly enhanced in the Fenton reaction meanwhile.And the L-RhB solution could be degraded nearly 100% in 1 min in the MoO2 cocatalytic Fenton system under the optimal reaction condition,which is apparently better than that of the conventional Fenton system(~50%).Different from the conventional Fenton reaction where the ’OH plays an important role in the oxidation process,it shows that 1 O2 contributes most in the MoO2 cocatalytic Fenton reaction.However,it is found that the exposed Mo^4+ active sites on the surface of MoO2 powders can greatly promote the rate-limiting step of Fe^3+/Fe^2+ cycle conversion,thus minimizing the dosage of H2 O2(0.400 mmol/L) and Fe^2+(0.105 mmol/L).Interestingly,the MoO2 cocatalytic Fenton system also exhibits a good ability for reducing Cr(Ⅵ) ions,where the reduction ability for Cr(Ⅵ) reaches almost 100% within 2 h.In short,this work shows a new discovery for M002 cocatalytic advanced oxidation processes(AOPs),which devotes a lot to the practical water remediation application.展开更多
文摘通过实验考察了四个不同催化反应的温度 T 及空速 H_v 对流动反应器催化转化率 x 的影响:(1)柴油所含芳烃的加氢饱和;(2)甲醇分解制氢;(3)渣油加氢脱硫;(4)一氧化碳水煤气变换反应,研究了流动反应器中催化反应转化率 x 与反应温度 T 及空速 H_v 的关系。对所得实验数据进行了拟合,提出一个新的反应转化率 x 表达式,其中α为反映空速 H_v 对转化率 x 影响的参数,k′_i(i=1,2,3)为与温度有关的系数。以此关系式对实验数据的拟合结果令人满意,平均相对误差小于2.0%。
基金supported by the State Key Research Development Program of China (No.2016YFA0204200)National Natural Science Foundation of China (Nos.21822603,21811540394,5171101651,21677048,21773062,21577036)+3 种基金Shanghai Pujiang Program (No.17PJD011)the Fundamental Research Funds for the Central Universities (No.22A201514021)Project supported by Shanghai Municipal Science and Technology Major Project (No. 2018SHZDZX03)the Program of Introducing Talents of Discipline to Universities (No.B16017)
文摘There is a relatively low efficiency of Fe(Ⅲ)/Fe(Ⅱ) conversion cycle and H2 O2 decomposition(<30%) in conventional Fenton process,which further results in a low production efficiency of ·OH and seriously restricts the application of Fenton.Herein,we report that the commercial MoO2 can be used as the cocatalyst in Fenton process to dramatically accelerate the oxidation of Lissamine rhodamine B(L-RhB),where the efficiency of Fe(Ⅲ)/Fe(Ⅱ) cycling is greatly enhanced in the Fenton reaction meanwhile.And the L-RhB solution could be degraded nearly 100% in 1 min in the MoO2 cocatalytic Fenton system under the optimal reaction condition,which is apparently better than that of the conventional Fenton system(~50%).Different from the conventional Fenton reaction where the ’OH plays an important role in the oxidation process,it shows that 1 O2 contributes most in the MoO2 cocatalytic Fenton reaction.However,it is found that the exposed Mo^4+ active sites on the surface of MoO2 powders can greatly promote the rate-limiting step of Fe^3+/Fe^2+ cycle conversion,thus minimizing the dosage of H2 O2(0.400 mmol/L) and Fe^2+(0.105 mmol/L).Interestingly,the MoO2 cocatalytic Fenton system also exhibits a good ability for reducing Cr(Ⅵ) ions,where the reduction ability for Cr(Ⅵ) reaches almost 100% within 2 h.In short,this work shows a new discovery for M002 cocatalytic advanced oxidation processes(AOPs),which devotes a lot to the practical water remediation application.
