SSCC 4493 GROUP ASSIGNMENT SAMPLE : KCC1 CATALYST: LECTURER : DR SITI AMINAH SETU
ABSTRACT Suitable instrument to identify the surface area of a sample is nitrogen physisorption analysis by using BET method which undergo process of adsorption-desorption of catalyst. High surface area silica catalyst has wide applications in almost every field.TheImportantly, the inherent properties of silica can be tuned by varying different parameters such as the size, shape, and morphology. The demand for silica nanosphereswith different sizes, dimensions and morphology is continuously growing because modern industries have spurred a tremendous interest for such materials.Theeffectiveness of these materials is mainly due to their micro and mesostructures which allow active molecules to disperse on the large internal surface and improving the activity. The accessibility of active sites inside the nano-silica particles is crucial as poor accessibility will limit their applications when significant mass transport is vital. Therefore, a high surface nano-silica with better accessibility was needed. In this study, the silica material sample called KCC1 was investigated. The surface area obtained is 531.14 .
Introduction of BET Brunauer-Emmett-Teller (BET) surface area analysis
BET Equipment Degassing Port Sample Holder Liquid Nitrogen
Pore Classification c = Macropore a = Microspore b a c 0.1 1 10 100 1 10 100 1000 b = Mesopore Pore Size
Properties of KCC1 catalyst The morphology of Mesoporous Silica KCC-1 The FESEM and TEM image of the KCC-1 catalyst
BET METHODO L OGY
KCC1 Catalyst Methodology
CALCULATION BET constant, C C = = 91 slope = 0.0081 y-intercept = 0.00009 Monolayer volume,Vm : = = 122.01 BET Surface Area S= 4.35 × molar volume S = 4.35 × 122.01 S = 531.14
CALCULATION slope = 0.0086 y-intercept = 0.00004 Monolayer volume, Vm: = 0.00004 Vm = 116.28 Langmuir Surface Area : S= 4.35 × molar volume S = 4.35 × 116.2791 S = 505.818 Langmuir constant K= = 215
CALCULATION • Micropore pore volume • = i × 0.001547 = -4.2673 × 0.001547 • = - 0.0066 • = 0. 0000 • MicroporeSurface Area • = SBET- Sext = 531.14 - 5378.92 • = -4847.78 • = 0.000 • External surface area • = s × 15.47 = 347.7 × 15.47 • = 5378.92 • Micropore pore volume • = i × 0.001547 = -4.2673 × 0.001547 • = - 0.0066 • = 0. 0000
CALCULATION Total pore volume = 1.0263 mesoporevolume for KCC-1 = 1.0263 micropore volume for KCC-1 = 0.000 1) Percentage of mesoporosity : = 100 % 2) Percentage of microporosity = 0.00 % total pore volume = micropore volume + mesopore volume
RESULT K C C 1
DISCUSSION FIGURE 1
DISCUSSION Figure 1 shows the nitrogen adsorption-desorption isotherms and the pore size distributions of silica KCC-1 based catalysts. The KCC-1 exhibited a type IV isotherm, with a H1-type of hysteresis loop which indicates that the presence of mesopores with highly uniform cylindrical structure and capillary condensation occur. BET has proved that KCC1 catalyst have higher surface area which is 531.14 and total pore volume of 1.0263 ml/g. At 0.4 pressure, the formation of a few multilayer formed at 0.9 of pressure indicates that all the pores was already filled.
DISCUSSION The Langmuir surface area for this KCC1 catalyst is 505.82 The Langmuir surface area depicts that the monolayer of the KCC1 catalyst have been filled. It can be said that the KCC1 have more pores since the monolayer surface area of the KCC1 catalyst is quite bigger. Based on the result, it can be claimed that the KCC1 catalyst is a mesoporous catalyst since it does not show any value of micropore volume.
DISCUSSION It is because presence of dendrimerfiber structure due to addition of more silica into the catalyst. Addition of more silica from tetraorthosilicate (TEOS) solution results in the properties of the KCC1 catalyst become a good basic catalyst. From the preparation of KCC1 catalyst, the cetyltrimethylammonium bromide (CTAB) acts as a cationic surfactantwhereas the urea act as hydrolyzing agent to allow the hydrolysis process occur.
CONCLUSION Nitrogen physisorption analysis is the most widely used technique to gather insight about textural properties by using Brunauer-Emmett-Teller (BET) method. The KCC1 catalyst which called silica based catalyst is one of the good catalysts that can allow society to use it for any reaction and application due to the dendrimer fibre and strong basic properties .
APPLICATION 1 1) Energy storage using DFNS-based supercapacitors
APPLICATION 2 2) Bioimaging using fluorescent DFNS coated with quantum dots STEM images and EDS elemental mapping of a) mSiO2@CdTe, b) mSiO2@CdTe@SiO2, and c) an ultramicrotomed mSiO2@CdTe@SiO2 slice
APPLICATION 3 TEM image of solid core-fibrous shell silica nanoparticles 3) High-performance liquid chromatography (HPLC) using DFNS-like silica
APPLICATION 4 4)Drug delivery using DFNS
APPLICATION 5 5) Extraction and detection of pollutants for environmental remedies
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