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P改性β沸石的制备及其催化C9芳烃与丙烯的烷基化反应性能研究

陈强强 郭宇 吴红梅

陈强强, 郭宇, 吴红梅. P改性β沸石的制备及其催化C9芳烃与丙烯的烷基化反应性能研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2021074
引用本文: 陈强强, 郭宇, 吴红梅. P改性β沸石的制备及其催化C9芳烃与丙烯的烷基化反应性能研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2021074
CHEN Qiang-qiang, GUO Yu, WU Hong-mei. Preparation of modified β zeolite with phosphorus for catalytic alkylation of C9 aromatics with propylene[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2021074
Citation: CHEN Qiang-qiang, GUO Yu, WU Hong-mei. Preparation of modified β zeolite with phosphorus for catalytic alkylation of C9 aromatics with propylene[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2021074

P改性β沸石的制备及其催化C9芳烃与丙烯的烷基化反应性能研究

doi: 10.19906/j.cnki.JFCT.2021074
基金项目: 国家自然科学基金(21601075);辽宁省高校基本科研项目(JZL201715403);辽宁省“百千万人才工程”项目(辽人社函〔2020〕78号)资助;辽宁省“兴辽英才计划”项目(XLYC2007171)
详细信息
    通讯作者:

    Tel: 13704168439, Email: guoyu@lnut.edu.cn

  • 中图分类号: TE624

Preparation of modified β zeolite with phosphorus for catalytic alkylation of C9 aromatics with propylene

Funds: The project was supported by the National Natural Science Foundation of China (21601075), the Fundamental Research Funds for the Universities of Liaoning Province (JZL201715403), the "Millions of Talents Project" of Liaoning Province ((2020) No. 78) and Liaoning Revitalization Talents Program (XLYC2007171)
  • 摘要: 利用浸渍法对β沸石进行磷改性,制备了不同磷负载量的改性β沸石催化剂。采用XRD、SEM、EDX、MAS NMR、Py-IR、N2吸附-脱附和NH3-TPD手段对催化剂样品进行了表征,并且研究了改性β沸石在催化C9芳烃与丙烯烷基化反应中的性能。结果表明:β沸石经磷改性后,其形貌和晶体结构没有发生明显变化。然而,随着磷添加量的增加,β沸石的比表面积和表面硅铝质量比逐渐减小;磷与β沸石相互作用,改变了催化剂酸强度分布。β沸石上磷的负载量显著影响C9芳烃烷基化反应结果。与未改性的β沸石相比,β-0.5P催化剂烷基化反应活性明显提高,烷基化反应产物中C12+重芳烃的比例达到17%,m1,3,5-TMB/mC9值增加了5.3%,连续反应10 h,活性稳定;然而,当磷负载量过高,催化剂烷基化活性降低,异构化和歧化反应性能增强。
  • 图  1  C9芳烃与丙烯烷基化反应流程图

    Figure  1  Schematic diagram of experimental setup for alkylation of C9 aromatics with propylene

    图  2  β沸石改性前后的XRD图

    Figure  2  XRD patterns of β zeolite before and after modified by (NH4)2HPO4

    图  3  样品的SEM照片:(a) β、(b) β-0.5P、(c) β-1.0P、(d) β-2.0P

    Figure  3  SEM images of (a) β, (b) β-0.5P, (c) β-1.0P and (d) β-2.0P.

    图  4  样品的EDX面扫描图(a–d)和元素组成分析(e)

    Figure  4  EDX mapping analyses (a–d) and elemental distribution (e) of the samples

    图  5  样品的27Al MAS NMR图谱(a)和31P MAS NMR图谱(b)

    Figure  5  27Al MAS NMR spectra (a) and 31P MAS NMR spectra (b) of the samples

    图  6  样品在400 ℃时的吡啶吸附红外光谱

    Figure  6  Py-IR spectra of the samples at 400 ℃

    图  7  样品的N2吸附脱附曲线(a)和孔径分布图(b)

    Figure  7  N2 adsorption-desorption isotherms (a) and pore size distribution (b) of the samples

    图  8  不同磷含量的β沸石的NH3-TPD曲线

    Figure  8  NH3-TPD spectra of different β zeolite modified with phosphorus

    图  9  沸石B酸中心与(NH4)2HPO4反应过程

    Figure  9  Reaction of diammonium hydrogen phosphate and brönsted acid site of zeolite

    图  10  样品在150 ℃(实线)和400 ℃(虚线)吡啶脱附的红外光谱图

    Figure  10  Py-IR spectra of the samples after desorption of pyridine at at 150 ℃ and 400 ℃.

    图  11  β沸石磷负载量对烷基化产物中均三甲苯与C9质量比的影响

    Reaction conditions: 3.5 MPa, 190 ℃, WSHV(propylene) = 5 h−1, n(C9)/n(propylene) = 0.8

    Figure  11  The value of m1,3,5-TMB/mC9 in the reaction products obtained by different β catalysts

    图  12  不同磷负载量的β沸石上烷基化产物分布(a)和催化性能对比图(b)

    Reaction conditions: 3.5 MPa, 190 ℃, WSHV(propylene) = 5 h−1, n(C9)/n(propylene) = 0.8

    Figure  12  Distribution of alkylation products obtained by different β catalysts (a) and catalytic performance of different β catalysts (b)

    图  13  不同催化剂的稳定性:(a) C9芳烃总转化率随时间变化曲线;(b) 邻甲乙苯转化率随时间变化曲线

    Reaction conditions: 3.5 MPa, 190 ℃, WSHV(propylene) = 5 h−1, n(C9)/n(propylene) = 0.8

    Figure  13  Catalytic stability of different β catalysts: conversion of C9 aromatics(a) and conversion of o-MEB(b)

    表  1  C9芳烃组成

    Table  1  Composition of C9 aromatics

    ComponentsNPBm, p-MEB1,3,5-TMBo-MEB1,2,4-TMB1,2,3-TMB
    w / %0.0510.6633.4155.140.720.02
    下载: 导出CSV

    表  2  不同磷负载量的β沸石的结构参数

    Table  2  Structure properties of differnet modified β zeolite samples

    SampleSurface area / (m2·g−1)Pore volume / (cm3·g−1
    SBETSMicroSMesoVMicroVtota
    β431.1302.5128.60.160.41
    β-0.5P429.2301.8127.40.160.42
    β-1.0P422.4299.5122.90.160.42
    β-2.0P395.0283.1111.90.150.43
    下载: 导出CSV

    表  3  磷修饰的β沸石酸强度分布

    Table  3  Distribution of acidity amount of β zeolite modified with phosphorus

    SampleLT-peakHT-peakTotal areaWeak acid areaStrong acid areaLT/HT*
    β210380377029258453.46
    β-0.5P210367376631306364.92
    β-1.0P212367374931496005.25
    β-2.0P200356287024534175.88
    *The ratio of low temperature (LT) peak area to high temperature (HT) peak area.
    下载: 导出CSV

    表  4  不同磷负载量的β沸石样品的吡啶红外数据

    Table  4  Py-IR data of β zeolite samples with different phosphorus loadings

    Sample150 ℃400 ℃
    B / (10−2 mmol·g−1)L / (10−2 mmol·g−1)B/LB / (10−2 mmol·g−1)L / (10−2 mmol·g−1)B/L
    β3.752.152.322.501.552.14
    β-0.5P2.871.842.081.901.421.78
    β-1.0P2.751.163.151.851.032.40
    β-2.0P2.350.644.891.730.593.94
    下载: 导出CSV
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  • 收稿日期:  2021-05-08
  • 修回日期:  2021-07-16
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