By introducing oxalic acid,succinic acid,and tartaric acid into the synthesis process of Mo-V-O composite metal oxides,the structure directing effect of polybasic organic acids on the crystal structure of Mo-V-O compo...By introducing oxalic acid,succinic acid,and tartaric acid into the synthesis process of Mo-V-O composite metal oxides,the structure directing effect of polybasic organic acids on the crystal structure of Mo-V-O compositee metal oxide was studied.Moreover,the prepared Mo-V-O samples with different crystal phase compositions were used to the conversion of glycerol,and the effect of crystal phase structure on its catalytic performance was investigated.Results show that the crystal phase structure of Mo-V-O can be regulated by changing the type and additive amount of polybasic organic acids.The crystal phase of Mo-V-O changed from MoV_(2)O_(8)to Mo_(0.97)V_(0.95)O_(5)with the increase of succinic acid and tartaric acid.The change in the Mo-V-O crystal phase is related to the amount of organic acid and the carbon chain length.When the crystal phase is MoV_(2)O_(8),the selectivity of acrolein and acetone is 25.7%and 16.2%.According to the XPS results,Mo^(6+)in MoV_(2)O_(8)promoted the formation of acrolein,while Mo^(5+)in Mo0.97V0.95O5 promoted the formation of acetone.So when the crystal phase is Mo0.97V0.95O5,the selectivity of acrolein and acetone is 11.9%and 24.6%.Therefore,the results of catalyzing glycerol can be controlled by selecting different crystal phases.展开更多
When the conventional sandstone acidizing technologies are adopted,many slugs are needed in the injection of prepad fluid,treatment fluid and postpad fluid,and consequently the production and operation suffers inconve...When the conventional sandstone acidizing technologies are adopted,many slugs are needed in the injection of prepad fluid,treatment fluid and postpad fluid,and consequently the production and operation suffers inconveniences and difficulties.In view of this,a kind of HA integrated acid system which is mainly composed of organic polybasic acids(HA)+HCl+HF and an efficient organic solvent was developed in this paper based on the idea of integrated acid replacing"multiple steps"and high efficiency and intensification.Via this HA integrated acid system,the complicated blockage in sandstone reservoirs can be removed effectively.Then,experiments were carried out on this system to evaluate its performance in terms of its retardance,organic blockage dissolution,chelating and precipitation inhibition.It is indicated that this new system can not only realize the acidizing of conventional integrated acid,but also present a good retarding performance by controlling Ht multi-stage ionization step by step and by forming silica acid-aluminum phosphonate film on the surface of clay minerals;that via this new HA integrated acid system,the organic blockage can be removed efficiently;and that it is wider in pH solution range than conventional APCs(aminopolycarboxyliates)chelants,stronger in chelating capacity of Ca^(2+),Mg^(2+)and Fe^(3+)than conventional chelants(e.g.EDTA,NTA and DTPA),and better in precipitation inhibition on metal fluoride,fluosilicic acid alkali metal,fluoaluminic acid alkali metal and hydroxide than multihydrogen acid,fluoboric acid and mud acid systems.These research results provide a technical support for the plugging removal in hightemperature deep oil and gas reservoirs.展开更多
基金Support Program,China(No.RC210184)Basic Research Projects of Liaoning Provincial Department of Education,China(No.JYTMS20231497)+1 种基金LiaoNing Revitalization Talents Program(No.XLYC2002001)Applied Basic Research Programs of Liaoning Province(No.2023JH2/101300243).
文摘By introducing oxalic acid,succinic acid,and tartaric acid into the synthesis process of Mo-V-O composite metal oxides,the structure directing effect of polybasic organic acids on the crystal structure of Mo-V-O compositee metal oxide was studied.Moreover,the prepared Mo-V-O samples with different crystal phase compositions were used to the conversion of glycerol,and the effect of crystal phase structure on its catalytic performance was investigated.Results show that the crystal phase structure of Mo-V-O can be regulated by changing the type and additive amount of polybasic organic acids.The crystal phase of Mo-V-O changed from MoV_(2)O_(8)to Mo_(0.97)V_(0.95)O_(5)with the increase of succinic acid and tartaric acid.The change in the Mo-V-O crystal phase is related to the amount of organic acid and the carbon chain length.When the crystal phase is MoV_(2)O_(8),the selectivity of acrolein and acetone is 25.7%and 16.2%.According to the XPS results,Mo^(6+)in MoV_(2)O_(8)promoted the formation of acrolein,while Mo^(5+)in Mo0.97V0.95O5 promoted the formation of acetone.So when the crystal phase is Mo0.97V0.95O5,the selectivity of acrolein and acetone is 11.9%and 24.6%.Therefore,the results of catalyzing glycerol can be controlled by selecting different crystal phases.
基金Project supported by National Science and Technology Major Project“Development of Large Oil and Gas Fields and Coalbed Methane”(No.2016ZX05058-003).
文摘When the conventional sandstone acidizing technologies are adopted,many slugs are needed in the injection of prepad fluid,treatment fluid and postpad fluid,and consequently the production and operation suffers inconveniences and difficulties.In view of this,a kind of HA integrated acid system which is mainly composed of organic polybasic acids(HA)+HCl+HF and an efficient organic solvent was developed in this paper based on the idea of integrated acid replacing"multiple steps"and high efficiency and intensification.Via this HA integrated acid system,the complicated blockage in sandstone reservoirs can be removed effectively.Then,experiments were carried out on this system to evaluate its performance in terms of its retardance,organic blockage dissolution,chelating and precipitation inhibition.It is indicated that this new system can not only realize the acidizing of conventional integrated acid,but also present a good retarding performance by controlling Ht multi-stage ionization step by step and by forming silica acid-aluminum phosphonate film on the surface of clay minerals;that via this new HA integrated acid system,the organic blockage can be removed efficiently;and that it is wider in pH solution range than conventional APCs(aminopolycarboxyliates)chelants,stronger in chelating capacity of Ca^(2+),Mg^(2+)and Fe^(3+)than conventional chelants(e.g.EDTA,NTA and DTPA),and better in precipitation inhibition on metal fluoride,fluosilicic acid alkali metal,fluoaluminic acid alkali metal and hydroxide than multihydrogen acid,fluoboric acid and mud acid systems.These research results provide a technical support for the plugging removal in hightemperature deep oil and gas reservoirs.
