摘要
采用高压水热法,制备了V_2O_5-Fe_2O_3复合纳米粒子,通过改变高压水热溶剂控制纳米粒子形貌。SEM和XRD测试结果表明:以H_2O_2为溶剂所得的B-V_2O_5-Fe_2O_3为棒状结构,且黏附有细小球状颗粒;以NH_3·H_2O为溶剂制得的Q-V_2O_5-Fe_2O_3为球状结构,两种形貌的复合纳米粒子结晶度均较好。利用H_2O_2和HNO3联合氧化法对商品化柱状活性焦(AC)进行改性得到改性活性焦(HAC),并以此负载不同形貌的复合纳米粒子制备B-V-Fe/AC和Q-V-Fe/AC催化剂。在烟道温度为200℃、空速为6 000 L/(kg·h)、催化剂用量为10 g、混合气体总流速为1 L/min(其中φ(O_2)=5%,φ(NO)=0.05%,φ(NH_3)=0.05%)的条件下,评价了各催化剂的脱硝性能。结果表明:B-V-Fe/AC催化剂脱硝性能最佳,B-V_2O_5-Fe_2O_3负载量为1.0%时,脱硝率最高达到69.42%,比HAC和Q-V-Fe/AC分别提高了17.75百分点和1.69百分点。
Two kinds of V_2O_5-Fe_2O_3 composite nanoparticle powder（ B-V_2O_5-Fe_2O_3 and Q-V2O5-Fe2O3）were prepared through high-pressure hydrothermal method with different solutions. The morphologies of the nanoparticles were controlled by solvent and characterized by XRD,SEM and TEM techniques. The results show that the B-V_2O_5-Fe_2O_3 nanoparticle using H_2O_2 solvent has a rod-like structure with some small spherical particles adhered on it. The Q-V_2O_5-Fe_2O_3 using NH_3·H_2O solvent possesses globular structure. And the crystallinities of both composite nanoparticles are better. The modified commercial columnar activated-coke（ HAC） treated with H2O2-HNO3 was prepared. B-V-Fe/AC and Q-V-Fe/AC catalysts with different morphologies of the composite nanoparticles were prepared by mixing HAC and B-V_2O_5-Fe_2O_3 or Q-V2O5-Fe2O3. At the conditions of 200 ℃,the catalyst amount of 10 g,simulated gas space velocity 6 000 L/（ kg · h） with a total flow rate of 1 L/min（ composition： φ（ O2） = 5%,φ（ NO） = 0. 05%,φ（ NH_3） = 0. 05%）,when the amount of B-V_2O_5-Fe_2O_3 is 1%,the denitrification rate is 69. 42%,which is 17. 75 percentage points and 1. 69 percentage points higher than that of HAC and Q-V-Fe/AC,respectively.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2016年第5期74-78,共5页
Petroleum Processing and Petrochemicals
